SciCombinator

Discover the most talked about and latest scientific content & concepts.

Concept: Valve Corporation

28

Reoperation for failing stentless aortic valve replacement is a technically demanding procedure that has traditionally been tackled in one of two ways: either root replacement or the more conservative option of implanting a stented valve within the valve. We sought to determine the relative operative risks, follow-up status and medium to long-term survival of these two methods.

Concepts: Derivative, Left ventricle, Aortic valve, Valve, Valve Corporation, Aortic valve replacement, Aortic insufficiency

18

Endobronchial valves (EBV) have been successfully used in patients with severe heterogeneous emphysema to improve lung physiology. Limited available data suggests that EBVs are also effective in homogeneous emphysema.

Concepts: Lung, Valve, Valve Corporation

9

To reduce the possibility of secondary deterioration of spinal injuries, it is desirable to maintain the spinal immobilisation that is applied in the prehospital setting throughout computed tomography (CT) scanning. A previous study found that metallic components within the inflation valve of the vacuum mattresses caused CT artefacts. The aim of our study was to investigate the effect of vacuum mattresses with plastic valves on CT artefacts, the radiation dose, and noise compared to a trauma transfer board and the spine boards currently used in our trauma system.

Concepts: Ionizing radiation, Aluminium, Physical trauma, Emergency medicine, Valve, Valve Corporation, The Spine, Board

4

Use of transcatheter aortic valve replacement (TAVR) for severe aortic stenosis is growing rapidly. However, to our knowledge, the durability of these prostheses is incompletely defined.

Concepts: Left ventricle, Aortic valve, Valvular heart disease, Valve, Valve Corporation, Aortic valve stenosis, Aortic valve replacement, Aortic insufficiency

2

Transcatheter valve-in-valve (VIV) implantation in small surgical tissue valves is challenged by the problem of residual stenosis. We report our first ten cases of fracturing small dysfunctional Mitroflow bioprostheses by high-pressure balloon dilatation to increase the internal diameter of the surgical valve before VIV (BF-VIV).

Concepts: Valve, Valve Corporation, Problem of evil

1

1

Early experience with transcatheter aortic valve replacement (TAVR) within failed bioprosthetic surgical aortic valves has shown that valve-in-valve (VIV) TAVR is a feasible therapeutic option with acceptable acute procedural results.

Concepts: Surgery, Left ventricle, Aortic valve, Valve, Valve Corporation, Aortic valve replacement, Aortic insufficiency, Bicuspid aortic valve

1

Sex-related differences in morbidity and survival in bicuspid aortic valve (BAV) adults are fundamentally unknown. Contemporary studies portend excellent survival for BAV patients identified at early echocardiographic-clinical stages. Whether BAV adults incur a survival disadvantage throughout subsequent echocardiographic-clinical stages remains undetermined.

Concepts: Sexual dimorphism, Sex, Left ventricle, Aortic valve, Valve, Valve Corporation, Aortic insufficiency, Bicuspid aortic valve

0

Mitral valve replacement (MVR) in very young children is challenging. This study investigates the mechanisms for early bioprosthetic valve failure in very young patients through review of the macroscopic and microscopic findings in explanted bioprosthetic valves.

Concepts: Mitral valve, Mitral regurgitation, Mitral valve prolapse, Mitral stenosis, Valvular heart disease, Valve, Valve Corporation, Mitral valve replacement

0

Using the pillar-shaped architecture of pillar[5]arenes, we constructed microporous multi-layer films with azobenzene groups on the top surface by layer-by-layer assembly of cationic and anionic pillar[5]arenes. Guest uptake, storage and release by the microporous films were regulated through photo-reversible isomerization of azobenzene groups attached to the pore outlets. Azobenzene was regarded as a “molecular valve” to control guest access: the trans form of the azobenzene acted as an open valve, allowing the guest free access from/to the micropores. Conversely, the cis form of the azobenzene behaved as a closed valve, completely blocking guest access from/to the micropores. Photo-responsive reversible uptake, storage and release of guest molecules were demonstrated through photo-isomerization of the azobenzene valves by irradiation with ultraviolet and visible light.

Concepts: Light, Molecule, 2002 albums, The Guest, Visible spectrum, Valve, Valve Corporation, Commonwealth of Independent States